Steam-generator.



1. P. FISHER.

STEAM GENERATOR.

APPuc-Alou FILED Juns24. 191s.

Patented July 23, 1918.

2 SHEETS-SHEET l Press um; Reyolahn* Jvllllllll 31a/Danie@ 1. P. HSHER.

STEAM GENERATOR.

APPLICATION FILED IUNE 24. I9I5.

Patented July 23, 1918.

2 SHEEIS-SHEET 2.

Ste am Tav-brac /f ENS SYN? ReguhfwI To all whom, t may Concern UNITED STATES PATENT OFFICE.

JAMES P. FISHER, OF BARTLESVILLE, OKLAHOMA.

STEAM-GENERATOR.

Be it known that I, ,latins I. FisHnn, a citizen of the United States, residing at Bartlesville, in the county of Washington and State ofOklahoma, have invented cci'- tain new and useful Improvements in Steam-Generators, of which the following is a specification, referencebeing had thei'ein to the accompanying drawing.

. and repair.

The invention relates particularly to steam generators using gaseous fuel and ,acting upon the water while the latter is Jassinn-throueh a' relative] small assiweway, no 'large reservoir of heated water being present." It will be understood, however,`that the invention in all of its as- ,lpects is not necessarily limited to a boiler .or generator of this type.

One of the objects of theinvention is to provide an improved arrangement of the water containing chambers whereby the maximum amount of heat is absorbed from the fuel and whereby the heating surfaces are protected vagainst burning. Another object of the invention is to provide means whereby a high velocity of water and steam may be maintained, thus preventing the formation and the deposit of scale. An-

` otherobject of the invention is to provide an improved means for separating the water and steam at a point prior to the entrance of the water into the main Vaporizing chamber. A further object is to provide an improved construction for the feeding, mixing and burning of the gaseous fuel whereby a uniform combustible'mixture is secured and whereby the heat is distributed vand conducted to the heating surfaces. yStill another' object of the invention is to provide an improved regulating mechanism whereby the amount of fuel supplied' is controlledi and regulated by the steam pressure. Other objects of the invention are to provide certain improved arrangevment of parts whereby there is obtained a fvery simple and lcompact structure which is capable of being` taken apart. for inspection Still other objects vof the invent-ion will `be apparent from the following speciiieation and claims;

Inthe accompanying drawingsI have shown two embodiments of the invention, it

now being my preference to embody the invention in one of these two ways. But it will be understood'that the invention can be embodied in other ways and that the drawings are `to be understood as serving illus- Specication of Letters Patent. Patented Illy 23, 1918. Application filed June 24, 1916. Serial No. 105,589. i i

certain ,of the partsbeingshown Tin eleva-` tion for the sake of clearness and simplicity.

Fig. 2 is a sectional view taken along the line 2-2 of Fig. 1.

Fig. 3 is a sectionalview taken along'the 1ine`3-3 `of Fig. l. l

Fig. 4 is a vertical sectional view showing another embodiment of the invention."

`A steam generator embodying my in* vention comprises a heating ror combustion chamber' having heatcondueting 'metal-lie walls with which the water to be vaporized is brought into contact. The arrangement is such that the Coldwater first contacts with that part of the heating surface which is engaged by the gases of .combustion asy they are about to enter the exhaust. y In this way the maximum amount of'heat is absorbed from the cases causing them tobe reduced to the minimum temperature before being discharged. lThe water next passes to that part of the heating surface which is engaged by the gases during combustion. At this point the temperature of the gases is greatest and without proper protection to anintermediate part of the heating sur-l face where the temperature is' "reduced somewhat below that of the pait lastl above mentioned and here the' water is vaporized. The combustion chamber and the water holding and conducting passages 'eanbe constructed in any 'of a number of ways. I

prefer, however, to providea central 1metallic tube l, such as is shown in Fig. 1 of the drawings, a section of boiler tubinghaving been found to he suitable. 4Thistube is "preferably arranged vertically, aslshown inv Fig. l, and means are provided for'causin'g a {low of gas therethrough. l Preferably, Aas shown in Fig. 1, there isprovided a suction fan 2 which is connected by means 'ofa pipe Y@forsupporting the said granular material.. At the other end of the tube Vat the top of 1,10

3 to one end of the Y'tube 1, *the* connectionA being through the Alower end as shown in Fig. 1. A major portion of the'tube l is filled with nelydivided lgranular refractory material"as"indicated 'at 4. lVhen `the eX- haust connection 1s made at the lower end, means such as indicated at 5 are provided the granular material, there is provided a plate 6 which has a number of perforations therein. Some of these perforations, as 1ndicateld at 7, communicate with the atmospherefat the top lof the plate, and another perforation, shown as centrally disposed, communicates. witha pipe-8 which leads Yfrom asuitablefsource of gas supply. The

gas is preferably maintained at atmospherie pressure by Aany suitable means,

such as a balanced gasometer, this `means, vghowever, not being shown as it. of` itself' constitutes; no part of my present invention.

' It will be understood that whenthe 'fan .2jis'-operated a partial iVacuum is created at the Gnd ofthe vtube l which is transmitted through'the tube to the top,'causing air to bedrawnin through the apertures, and gas to b e drawn in through the pipei. The air and gas movethrough the interstices ofthe granular material and quickly become miXjed. Combustion is started in Vthe upper partof vthe tube and the air .andgas unitecausing intense heat. f The zone offcombustion be- Y retarded giving ampleopportunity for the .-.heattobe absorbed by the wallsof the tube. The,refractory material, by causing the in- .timate eomminglingef theair and gas as y.bef or e..stated, insures great;A rapidity of coml Aj"bustion and .a high rate of transmission off 50. heat te'.y and through the tube walls. l

'-.chamber in this case the tube l isa water Surrounding the combustion Y or-heating [Chamber or VYcontainerv`v preferably divided .2 into three separatesections'. Y .The upper vsection 9 of the watercontainergis formed by a tube 104 arranged wconcentrically .withthe f tube l1 ;thefcentralsection 1l of the water r'jrcontain'er. isformed byatube l2Y also'V conareqseparated from eachother.

ratingthelsections 9 and 11- there is prefl Y lbei'ng'that only a small part ofthe 'water is .centricjlwith the' tubel;V and thelower secg 'tionl ,'ofthe watencontainer isV formed by .a tuba-,14..also concentricjvith the tubel. Thel threefisections. .of theV water,- container For sepawater tightffintact with the tube 1 1 and f imum cooling effect on the gases.

which iis clamped between the two flanges 10 and 12. Between the container sections 11 and 13 there are preferably provided two vplates l8and 19 between whichis clamped va copper-gasket .2 0 which engages the pipe 1.

The two plates' Y18 and 19 are engaged 4by flanges 21 and 22 secured respectively tothe tubes12 and 1 4. The upperend ofthe tube.

l0 is lcontracted' and is Yprovided with a .stufliug box 23 which engagesthe tube 1 providing a' oint which is tight but. which nevertheless permits relative movement between the tub'esgl and ]Oz on account `of differencesin expansion and contraction. The lower end.' of the tube Mis `similarly conupper chamber 9 Vis 'a similarspiral` vane 27 having similar separators 2 8, this vane' dif- 16 and 17 secured respectively Vto the tubes Y ,tracted yis provided Awith' asimilar i stuing box 2 4 which engages they tube l.`

In the chamber lthere is provided a spiral baffle or vane 25 which, connects with vthe outersurface of,thetubel and the inner surface of the tube 14g Interposedy betweenadjacent parts of this vane areseparators" 26 arranged -at Vsuitable intervals.,v In the* fering from the vane Q5. yin thatthe pitch isV4 somewhat greater.l In the middle chamber f ll vis another spiral vane`29 with separators 30. Thepitch of this vane isconsidera-bly greater than that of 'the vane At l'is a water supply pipeleading into ythe'bottolnof the chamber 1 3. The water entering throughwthi's pipe flows around the spiral passage between the parts of the vane 25 `andffnally reaches the upper end of the to Vagitate thewater and insurefall parts of itfbeingbrought 'into contact with the heatingsurface. The waterbeing cold absorbs the v maximum amount of 'heatg from the chamberl. In passing through this spiral` Y lpartsof the vane lproperly Vspaced also serve gases, leavingthem. relativelycool as they pass into Athe tube l. Itfwill bey observed that in this section ofthe tubes the; counterflow principle is used thus. securing Vth'e max vF rom the upper en d of the 'c hamberi thewater passes through a'pipeQ toth'e v upper 4end of thechamber 9. fH'ere the water enters the spiral p'as sagef betweenl the .parts of thevane 27 and flows to the lower end spi ral V passage tliefwater contacts with ith'at lpart of the tube 1 which incloses- Vthe burn- "ing-gases-1 The water entering this chamber 1 9, while somewhat heated, is V-nevertheless vsomewhat below the. boiling point, the Iresult vaporized. There is therefore assurance that in this chamber the walls of "the tube 1 willbe in contact with water and thus protected against burning which might otherwise resultbecause of thepintense heat on From the bottom Whatever steam may have been formed, passes through the pipe 33 into the reservoir. 34. The pipe33, after entering the reservoir, is turned up at 35 thus bringing fits discharge point near the top of the reservoir. In this reservoir any steam that has been formed is` separated from the water 4which collects in the bottom, its height being registered bythe gage glass 3G. From the bottom of the reservoir 311 the Water passes through a pipe 37 into the loweiend of the chamber 11.

Here the water passes through the spiral passage between the parts of the vane 29 and is vaporized by its contactwith thegwalls of the tube 1, these walls vinclosing theY hot gases of combustion. The `separators 30 assist in the vaporizationY by insuringpthecontact of all of the'water vvith the heating surface. All of the water is converted into steam in this chamber 11 and the steam is discharged through the pipe 38. A by-pass pipe 39 connects theiipper section `ofthe chamber 11 with the upper part of the reservoir 34 thus serving to maintain a uniform pressure inthe chamber and reservoir, and also serving to conduct the steam collected in the reservoir into the chamber where it can be discharged through 'the pipe 38.,I The by-pass pipe 39, by equalizingthe pressure in the container section 11 andin the reservoir, as before mentioned,

l ,serves to maintain the water in the reservoir chamber as well -as in the reservoir.

andin the section 11 at the same level. For this reason'thegage glass 3G serves to indicate the level of the water in the vaporizing It is therefore possible for one to observe the water level and ascertain whether or not the water fis being vaporized inthe vaporizing chamber at theproperrate. Preferably a battle is provided .in the reservoirlat 40 to i to the steam.

prevent the discharge of water into thepipe y39. .A A steam' gage 11 is preferablycoimect- I ed with the reservoir 34k to indicate the pressure.

y Inasniueh las the gas supply is maintained at atmospheric pressure, it willl be clear that the ratio of gas, torair will be constant notwithstandingvariations in the rate ofHoW. In practice the frateof {low of gas andiair is yso ncontrolled with respect to' the rate, of

`walten-. supply,.thatl all of thewater entering the chainber 11 lis completely vaporized. VBy increasingtheamount of gas and air' any desired degree of superheat can be given Preferably the fan 2 driven by a turbine or other steam motor receiving its steam from the pipe 38 through a suitable supply pipe as indicated at 4:3. The connections are such that as the steam pressure in the pipe 38 increases above normal, the speed of the turbine and fan is reduced thus reducing the supply of fuel and permitting the steam pressure to drop. When the steam pressure falls below normal, the speed ofthe turbine and fan is increased thus increasing the amount of fuel and causing steam pressure to rise.

It will be observed that the space avai1a ble for the flow of the water, or the water and steam, increases from the point of inlet at 31 te the point of discharge at 38. In the chamber 13 the spiral passage is relatively narrow as there is only Water to be handled; in the chamber 9 the spiral passage is somewhat wider as some steam is present; and in the chamber 11 the spiral passage is very much Wider as there is much steam to be ac-4 A commodated. All of the said spiral passages are designed to give high velocity of flow therethrough so as to prevent the deposit of scale on the heating surface.

From the foregoing description and from the drawings it will be clear that the whole mechanism is so constructed as to be capable of being readily taken apart. The outer tubes 10, 12 and 14 can be removed from the tube 1 and can be separated from each other, and the several spiral vanes can be removed. In this way all of the parts of the apparatus are readily available for inspection or repair or replacement.

In Fig. 4 there is shown another embodiment of the invention which is very similar to that shown in Fig. 1, the essential difference being that the gases are drawn out 0f the top of the combustion chamber iustead of out of the bottom. In this connection l represents the central combustion tube connected at its top with a fan 2 by means of a pipe 32 Granular material .4 is placed in the tube and is supported on a plate 6 similar to the plate G already depasses through a pipe 33 to a reservoir 34% From the bottom ofthe reservoir 34 the water passes through a pipe 3T 4to the bottom of the chamber Da. YIn the bottonrof this chamber there is a spiral vane :27" forming a spiral passage along which the water passes upward. In the upper part of the chamber 9 is another spiral vane 29 forming a spiral pa'ssage'through 'which 'the Water, together with thesteaim'passes np- Ward. At the upperpart ofthe chamber 9a Y"'thele'is connected apipeBS byivliiehthe ivithl the" upper part of thelrese'rvoir 84 steam is discharged. A'by-passpipefii conneCts the upper; part' of the' chamber 9 jIt Will be observedtthat inthis 'construction, as in the one first describedfthelcold Water is irst broughtinto' contactivith that part of the heating surface Which surrounds the partly cooled gases, and then the Water passes to the "partY of theY heating snrface which siirronnds the'burning gasesV and inally the water, with the steam', engages that part ofthe'heating surface whichl surrounds vthel [gases of c ombustion By the arrangement shown in fl, lhave avoided the necessityv for three separateivatejr chambers but have nevertheless retained thelprincipal y advantages', Apresent inthefl'tirst` described construction. The r'nanner of Qperav tion of this embodiment of the invention and the advantages thereof iare similar to those already described, and ,-repetitionivill'be unf necessary. l Y l p t Y YIt will be understood that many changes may .be made in the construction illustrated .and various substitutesof equivalents Withlio out departing from the spirit of`v the'finvention'. y M Y What is claimed is 1. YIn a steam generator, theA combination of a` heating'y chamber, la Water'ycontain'er having a section-divided from the remainder thereof and positioned adjacent the final or discharge part ofthe chamber, mea'nsrf'or leading Water into the said'section, 'means for leading Water from the saidsection first to apart of the'container adjacent the ini- Vtial'or combustion part of the chamber and vthen to a part of the vcontaineradjacen'fthe intermediate part Yof the chamber,V the'rsaid kmeansincluding a' reservoir separatefrom the container. and interposed between the Vsaid-section and the Saidpartndjaeent the intermediate part of the chamber, and afby- ,pass pipe-'connecting the]reservoir'ivith the last said part of the 'containerfand positioned abovethe Water level. Y

2. In a steam generator, 'the combination of a .heating chamber, alWaterA container having three Aseparate sections of which' Ione isadjacent the final Vor dischargepart ofthe chamber, the second adjacent theA 'nitial'or combustionpart of the chamber and vthe third adjacent the intei'mecliate'part ofA the Y chamber, a reservoir separate 'from the container, means for :lefading Water successively through the first sectionpthe-second section, .f

' fthe; reservoir vand AthezthirdV section;- `and a by-pass pipe connecting thereservoir with the third section and-positioned with its end above the Waterv level in the4 reservoir..

3. In a steam generator, the combination `*0f- 'a' tubular :heating chambelyfaftubular 'Water Ycontainer snrrounding 4the chamber and dividedfintov affplurality of sections, a

s'piralvane in each section Vproviding a spi-ral Water into t'liefsectio'n of lthe container near ``the icinal'or discharge partofthev chamber,

'and meansfor leading-the Water from the said section'first `toga part of the c0ntainer "adjacent the initial or 'combustion' part :of the chamber andthen to 'apart ot' the Icontainer adjacent-'the intermediate lpart ofthe chamber; y l v Y a L In asteamgeneraton'the combination of tubular heating "chamber, ai tubular' Water container surrounding 'the chamber vpayssage ,for the Water, means forleading'f' 'ianddivided into aj plurality ofjsections, a i

spiral vane in1 each section providing a spiral path forfthe Water, means for leading Waiter 7into Vthefremote end of thegsection 'of "the Vcontainer near the, final tor discharge partV -of the chamber", and ineansfor vlefading:the i Water from the near end of thev saidfsect'ion Y to`the"`opposite endofthe containerfadja- [cent theI initial'or combustionlpart ofthe-DO of a'vertical Aheating chamberv in Which com- Hbustion occurs in the upper part the gasesfof `'combustion ybeing 'disehargedfdownwardg a :vertical tubular Water vcontainer"surronmilj ing the' chamber and divided into three sections, means f'or leading Water intojthev :lower en d Voftheloiver section fnear the 'iinal "or Vdischarge* part of the chamber' i means for leading the Watery from ft'hefupper end'of vthe loxver `section tofthenpp'er endfof the np'pjer "seetionj'adjacent thclrini-j, l

',Qtial for V coinl'iustion ,partv of the f'chamber, means' for leading the Water from the/lower f end of thel-astysaid section vto thelovver-end Y y of the `,y third. or intermediate"sectiong and jineans "for Areceiving partf'o'f the "intermediate section.V

steam 'from the .upper ,l M K l V-`steam?'generator, the 'combination ,of a' vertical heating chamber :1ny LWhichcoml bustioniocciirs in theupperpart theffga'ses ofcombustio'n' [being discharged d'ovvnvv'arld,yl

, averticaltubular Watercontainer surroundthechamber anddivided into'three sec- "t'ions, a .spiral'vane in each section providing a spiral path for 'the Water, means :for ,leading Water into the .lovvenendiof the lower section near ,the final' ory discharge iso part of Lrthe chamber, means `for ,leading ithe water from the upper end of the lower section Ato ,the upper ,end Aof .the upper section adjacent 'the initial or combustion part of the chamber, means Efor l,leading the water from ,the rlower end of the last said ysection to the lower lend of the ,third or intermediate section, and means rfor receiving .steam from the upper part of ,the intermediate section.

S. In a `steam `generator, the combination of a vertical ,heating chamber in which combustion occurs ,in the upper part ,the gases of combustion being discharged downward, a vertical tubular water container surrounding the chamber and divided ,into three sections, means for leading water into the lower end of 'the lower .section `near 4the `final or discharge part 1ofthe chamber, means for leading ythe water from lthe upper end of the loaver section to the upper end Aof the upper section ad'acent the initial or combustion part of ,the chamber, means for leading the water from .the lower ,end of the last said section ,to the lower fend ot' Vthe third or intermediate sectiop, means for receiving steam from ,the upper part of `the intermediate section, and spiral'vanes located respectively in the several sections and providing a spiralpath lor the water through each `ol" them, the second vane having a greater pitch than the first and the third having a greater pitch than the second..

9. I n a steam generator, Athe combination of' a vertical heating chamber in which combustion occurs in the upper part Vthe gases oli' combustion being discharged downward, a verticaltubular water container surrounding the chamber and divided into three sections, means for leading water into the lower end .of the lower section near .the final or discharge Vpart of `the chamber,

means for leading the `water from the upper 'end'of the lower section to `the upper end of the upper section adjacent the initial or combustion part of the chamber, means for leading the water 'from the lower end of the last .said section to the lower end of the third or intermediate section, means ttor receiving steam from the ,upper part of the intermediate section, spiral vanes located respectively in the several sections and providing a spiral path for the water through each of them, andconnectors between ad-y jacent coils of the vanes serving` to hold the coils properly spaced and also serving to deflect the water.

10. In a steam generator, the combination of 4a vertical heating chamber in which combustion occurs in the upper part the gases of -combustion `being discharged downward, a vertical tubular water container surrounding the chamber and `divided into three scctions, means for leading water into the lower end of the lower section near the final or discharge part o'l the chamber, .means for lcadingthc water 'from theiupper end of the lower section to the upper end ol the upper section adjacent thcfinitial or combustion part ol the chamber, a reservoir connected to `receive water and steam .from the lower end of the last said section, means `it'or leading water from the bottom of ,the reservoir to `the lower cndvot' the third or intermediate sectiomiand lmeans for receiving` steam from the upper part of the intermediate section.

11. In a steam generator, the combination otl a vertical heating chamber in which combustion occurs in the upper part the gases of combustion being discharged downward, a vertical tubular water container surrounding `the chamber and divided into three scctions, `means for leading water into the lower end ol the lower section near the final or discharge part of .the chamber, means 'for leading vthe water from thc ,upper end of the lower section to the upper end of the upper section adjacent the initial or combustion part of the chain? ber, `a reservoir positioned at the saine e'levation as the third or intermediate Vsection and connected to receive water from the lower end of the upper section, means for leading the water from the bottom of the reservoir to the lower end `ot the intermediate section, means 'for recei ving steam from the upper part ol the intermediate section, and a gage glass connected with `the reservoir and serving to indicate the level ot' the water in the reservoir and in the intermediate section.

1 2. In a steam generator, the combination of -a vertical lheating chamber in which combustion occurs in the upperV part the gases of combustion being discharged downward, a vertical tubular water container surround- -ing the chamber and divided into three sections, means tor leading water into the' lower end of the lower section near the final or discharge part of the cham'- ber, means forileading the water from the upper end ol the lower section to the upper end of the upper section ,adjacent the initial or combustion part of the chamber, a reservoir connected yto receive water and steam from the lower end of the upper section, means Yl'or leading the water from the bottom of the reservoir to the lower end of the intermediate section, means 'for leading the steam from the upper part of the reservoir to the upper end of the intermediate section, and means tor receiving steam from the upper part ot' the intermediate section.

13. In a steam generator, the combination of a vertical heating chamber in which coinbustion .occurs in the upper part the gases oit combustion being discharged downward, a vertical tubular water container surrounding the chamber and divided into three sections, means for leading water into the lower end of the lower section near the final or discharge part of the chamber, means for Y leadingV the water from the upper end of the l lower section to the upper end of the upper section adjacent the initial or combustion part-of Vthe chamber, a reservoir'connected to receive water and steam fromthe lower end of the uppersection, means for leading the water from the bottom of the reservoir Y to the lower end of the intermediate section,

means for leading the steam from the upper part of the reservoir to the upper endof the intermediate section, means forV receiving steam from the upper part of the intermediate section, and avgage glass connected with the reservoir and serving to indicate Y tube adjacent the initial or combustion part the level of the water in the reservoir andv in the intermediate' chamber. f Y.

e 14. In a steam generatonthe combination of a vertical heating chamber in which coinbustion occurs in the upper partV the gases of combustion being discharged downward, a

vertical tubular water container surrounding x the chamber and divided into three sections,

means for leading water into the lower end of the lower'section near the final ordischarge part of the-chamber, means for leading the water fromV the upper end of the lowersection to the upper end of the upper e section adjacent the initial or combustion part of the chamber, a reservoir, a ,pipe connectedto deliver water and steam from the lower end of the uppersectionto the reser- Y voir, the said pipe entering thereservoir and having vanoupturned partlterininatnig near the top of theVY reservoir, vmeans ior leading Vthe water from the bottoniof the reservoir to the lower endofthe intermediate section, ahy-pass pipe for leading the steam fromV theruppe'r partof the reservoir to the upper end of the intermediate section, lmeans for' VVreceiving steam from the upper part of the l intermediate section, and a baiile in the.

reservoir interposed between the `out-let endl:V V0f the Vwater pipe and the inletend of the steam bylpass pipe. l' i .Y Y e v n l5. In a steam generator, the combination of a heating-chamber consistingof Va single metal tube in which combustion occurs near one end lthe gases` of' combustion being dis.

chargedjat the other end, a tubular v'water container.surroundingthe chamber and com .prisingthree separate metal tubesmeans for closingthe ends of the tubes to form three. Vseparate sections, means for leadingwater into the remote end of the tube near'the inal or-discharge part of the heating chamber, Ymeans for leading the water from thenear endof the said'tube to the remote'end of the of theV chamber, and means for leadingv the water vfrom the near end of the last said tube Y Copiesof this patent mayV be obtained'. for

to the opposite end diate tube. K Y e 16. In a steam generator, the combination of a heating chamber consisting of a single ofthe third or intermey metal tube in which combustion occurs near -V one end the gases of combustion being dis,- cliarged at the other end, a'tubular water container surrounding the chamber and com# prising three separate metal tubes, a divi- Y sion plate between each two adjacent tubes,-

charged at `the other end, a tubular -Wate'rff container surrounding the chamber and comprising three separate metal'tubes,` a divi' sion plate between each twoadjacentftubes,

each plate closely engaging the heating'y Yso chamber tube, Vmeans for closing the outer ends of the end tubes comprising stuiing boxes engaging the'v heating chamber tube,

and means for leading-water through the said water tubes successively.

18.' Infa steam generator, the combination of a heating chamber'consisting of a'single niet'altube in rwhich combustion occurs VnearV one Vend thelgases of combustion being dis# charged at the other end, a tubular water container surrounding the chamber and comprising three separate lmetal tubes, the

outer vends oi the end tubes being con' tractedto engage'the heating chamber tube,

a division plate betweenjeach two adjacent tubes, each plate closely engaging the heat'-A ing chamber tube, stuffing boXes at the outer ends of the endV tubes engaging the heat ing chamber tube, and means for rleading. water through the ^said watertubes succesY V19. In a steam generator, the combi-nation, of 'a heating chamber zconsisting of a ,singleA metaltube in which combustion occurs near. oneend thev gases ofcombustion being discharged 'at the other end, a tubularwater;

V container surrounding the chamber and'come' Vprising three 'separate metal tubes, the last said tubes being detachable from each other and from the heating chamber tube, a divie sion plate between each y'two 'adjacent tubes,

each plate closely engaging the heating chamber tube, means for closing the outer ends of the Vend tubes,andmeans for leading'waterthrough thev said watertubes suc- Y cessively.

In testimony whereof, I aiiii V signa-i ture.

JAS. r.` Fisriiiii.VV

five cents each, by adressing `thel`Conimissjir011er of Patents. Washington, D. C. 

